The relay part number is Williams # 5580-09555-01 and Marco definitely stocks it.
https://www.marcospecialties.com/pinball-parts/5580-09555-01
The one they sell has a clear cover so you can see the contacts.
Other equivalent relays are these:
Guardian Electric # A410-367279-13
Guardian Electric # 1395 PVS-2C-24D
Potter and Brumfield # K10P-11D55-24
Omron # LY2-0-US-DC24
Mouser Electronics # 653-LY2-0-DC24
Phillips ECG # RLY2343P
NTE # R14-11D10-24P