Vintage BOKER Tree Brand 493 folding knife

This auction is for a BOKER TREE BRAND MODEL 493 folding knife. I found this in a box of antiques at my 83 year old Aunt's home. This knife is in good condition with the exception of rust or scuffing which can be seen on the 2nd scan. I don't know too much about knife collectibility, so I have not tried to clean or remove the rust. If you have any questions, I'll do my best to answer them.

Thanks for looking!!!