1956 Browning Semi Auto 22 question
I bought what I was told was a 1956 Browning semi auto .22 at last week's gun show from an individual carrying it in. I have familiarized myself with these somewhat, and felt comfortable buying it considering it was Belgium made, short only, and had the wheelsight. My question is the location of the serial number. On the steel buttplate there is A159 marked. The "A" is smaller than the 159. Is that the correct location for the serial number in 1956? Is there another location I should look for a matching serial number or additional marking I would expect to see.