have a look at this website. i have a few one armed bandits myself and some of the ones i have appear in this website.
note- most poker machines (60's to late 1970's are from the U.K.) later stuff from the USA.
send me a photo and i will help with my contacts. I recently put a large security system into a business who has been restoring/selling pokies for the last 40 years. he will know it i am sure. regards, brett

http://www.pennybandit.co.uk/10.html