I am not authorized to Practice Law in the State of California: However. many states have an exemption for the possession of residential (non-gaming) display of antique slot machines. The term 'antique' usually means 25 years or older. I have copied the applicable California Penal Code Section:

Slot Machine Legal States

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330.7. (a) It shall be a defense to any prosecution under this
chapter relating to slot machines, as defined in subdivision (d) of
Section 330b, if the defendant shows that the slot machine is an
antique slot machine and was not operated for gambling purposes while
in the defendant's possession. For the purposes of this section, the
term 'antique slot machine' means a slot machine that is over 25
years of age.
(b) Notwithstanding Section 335a, whenever the defense provided by
subdivision (a) is offered, no slot machine seized from a defendant
shall be destroyed or otherwise altered until after a final court
determination that the defense is not applicable. If the defense is
applicable, the machine shall be returned pursuant to provisions of
law providing for the return of property.
(c) It is the purpose of this section to protect the collection
and restoration of antique slot machines not presently utilized for
gambling purposes because of their aesthetic interest and importance
in California history.

State and Federal Laws

Gambler’s Paradise complies with all state and local laws pertaining to sales and distribution of casino equipment. The following chart shows to the best of our knowledge the current and correct information on the legal requirements for slot machines in the various states. Laws may change or vary from time to time and we assume no legal responsibility based on this listing. It is your responsibility as the purchaser to check state and local requirements for gaming equipment prior to purchase of any slot machine from Gambler’s Paradise.

Slot Laws In The United States | Gameroom Show

Resource

SLOT MACHINE LEGAL STATES - Worldwide Gaming Inc

StateLEGAL STATUS RESTRICTIONS/USE OF CURRENCYLEGAL REFERENCE
AlaskaALL LEGALAlaska Statutes – Section 11.66.260
ArizonaALL LEGALArizona Revised Statutes 13-3301 – 13-3309
ArkansasALL LEGALN/A
KentuckyALL LEGALKentucky Revised Statutes 528.080
MaineALL LEGALMaine Revised Statutes Title 17A – Chapter 39
MinnesotaALL LEGALMinnesota Statutes and Criminal Laws
NevadaALL LEGALN/A
OhioALL LEGALOhio Revised Code
Rhode IslandALL LEGALRhode Island General Laws
TexasALL LEGALTexas Statutes Chapter 47
UtahALL LEGALN/A
VirginiaALL LEGALN/A
West VirginiaALL LEGALN/A
CaliforniaMACHINES 25 YEARS OR OLDERCalifornia Penal Code 330.7
ColoradoMACHINES MANUFACTURED PRE – 1984Colorado Revised Statutes 12-47.1-103
DelawareMACHINES 25 YEARS OR OLDER28 Delaware 904
FloridaMACHINES 20 YEARS OR OLDERFlorida Statutes 849.235
GeorgiaMACHINES MANUFACTURED PRE – 1950Georgia Code Title 16, Sec. 16-12-24
IdahoMACHINES MANUFACTURED PRE – 1950Idaho Statutes Title 18, 3810
IllinoisMACHINES 25 YEARS OR OLDERIllinois Compiled Statutes 720 5/28-1
IowaMACHINES 25 YEARS OR OLDERIowa Code 725.9
KansasMACHINES MANUFACTURED PRE – 1950Kansas Statutes 21-4306
LouisianaMACHINES 25 YEARS OR OLDERLouisiana Title 15:31-1
MarylandMACHINES 25 YEARS OR OLDERMaryland Code Article 27-264B
MassachusettsMACHINES 30 YEARS OR OLDERMassachusetts General Laws Ch. 271, Sec. 5A
MichiganMACHINES 25 YEARS OR OLDERMichigan Compiled Statutes 750.303
MississippiMACHINES 25 YEARS OR OLDERMississippi Code 27-27-12
MissouriMACHINES 30 YEARS OR OLDERMissouri Revised Statutes 572.070 & 572.125
MontanaMACHINES 25 YEARS OR OLDERMontana State Code 23-5-153
New HamsphireMACHINES 25 YEARS OR OLDERNew Hampshire Revised Statutes 647:2
New JerseyMACHINES MANUFACTURED PRE – 1941New Jersey Statute 2C:37-7
New YorkMACHINES 30 YEARS OR OLDERNew York Consolidated Laws 225.32
North CarolinaMACHINES 25 YEARS OR OLDERNorth Carolina General Statutes 14-309.1
North DakotaMACHINES 25 YEARS OR OLDERNorth Dakota Century Code 12.1-28-02
OklahomaMACHINES 25 YEARS OR OLDEROklahoma State Statutes 21-964
OregonMACHINES 25 YEARS OR OLDEROregon Revised Statutes 167.147
PennsylvaniaMACHINES 25 YEARS OR OLDERPennsylvania Consolidated Statutes 5513
South DakotaMACHINES 25 YEARS OR OLDERSouth Dakota Codified Laws 22-25-14.1
Vermont MACHINESMANUFACTURED PRE – 1954Vermont Statutes Title 13, Ch. 51, Sec. 2135
WashingtonMACHINES 25 YEARS OR OLDERRevised Code of Washington 9.46.235
Washington, DCMACHINES MANUFACTURED PRE – 1952District of Columbia 22-1704
WyomingMACHINES 25 YEARS OR OLDERWyoming Statute 6-7-101
AlabamaPROHIBITEDAL Code Section 13A, Chapter 12, Article 2
ConnecticutPROHIBITEDConnecticut Chapter 946, Section 53-278a
HawaiiPROHIBITEDHawaii Statutes §712-1226
IndianaPROHIBITEDIndiana Code 35-45-5-4
NebraskaPROHIBITEDNebraska Revised Statutes Section 28-1107
New MexicoPROHIBITEDNM Gaming Control Bd. v. Ten Gaming Devices
South CarolinaPROHIBITEDSouth Carolina Code §12-21-2710
TennesseePROHIBITEDSTennessee Code §39-17-505
WisconsinPROHIBITEDWisconsin Statutes Chapter 945