hoppy 590, actually ALL of the 91/30 bayos were very carefully kept with each rifle, they are hand fitted to each particular rifle and its very common to have the same ## match at least the reciever..
As far as other mis-matched parts, lets use the Yugo mausers as an example, in this case it is very un-common to have a matched bayo simply because of the way these rifles were sold, the importers bought say 5,000 rifles then say 8,000 accesary kits, these kits were assembled by the staff at the Armory were the rifles were stored, importers do not go to the trouble of trying to match up the kits to the correct rifle hence the bayos get all mismatched, now I do have an extremally rare example being a 24/47 in mint condition serial number 0033 no prefix it is literally the 33rd rifle built in 1924 furthermore it still retains ALL of its original components total matching had never been fired AND it had its serial matched bayo........... what makes it so rare? aside from whats been listed so far it also was hand picked by ME before it was imported, I boxed it and numbered the crate when it arrived with the first shipment it was put aside for me, I had duct taped the bayo to the rifle to ensure it would not be lost....
I watched as all of the 24/47s and m48s for that shipment were crated, accesaries in seperate crates etc... well when they got stateside a dealer orders 10 rifles and 10 accesary kits, they just grab them outa each crate from the top no attempt to match anything even though the correct kits were in those accesary crate to match those rifles............
Many bayos are lost on the battle field or stolen by soldiers or sold etc... in that case a replacement is renumbered when the rifle is re-arsenaled but in the case of 91/30S loseing your bayo was grounds for immediate punishment,