Hey I really appreciate it!! Being born and the tail end of the vinyl age, I'm afraid my knowledge on record sizes is limited. 
A friend loaned me a couple vintage records and I'll try and describe them..... Definately flat and not cylindrical, bigger than a 45, thicker, and they feel like if you would drop them they would shatter in a million pieces. You know how records from 70's bend.... these don't. I don't know if it will play the records from the 70's or not. My mom has a few 45s but I haven't tried. I think I'll do that this evening. I have a little piece from another record player I can use to put in the hole...
The woman that gave it to my grandad said it was 100 years old, and the friend that I borrowed the records from has one also, she thinks hers was bought in 1903 or 1906 and they are very similar in shape. She is 74 and said she played the some of the records when she was a teenager. I found a Victor Victrola website that will help me identify its age. I'll let you know.
Thanks again!!
Hugs,
Brooke