yes it is a 560 and it was not a regular production item avable in the cataloge.
there were 8 that i know of, i have one and Joe has 4, another friend has one and i don't remember were the other 2 are...
and while we are at it here is one i can not afford to buy an still remain married and there are only 4 of these and they were made i think by Leroy Remmer when he worked at buck tho i might be wrong... dang mind goes before any thing else... this is currently owned by H. Kinkhammer. i hope i got the name right...and i could have had it but heck i like being married...