This won't help Tom in is research either; but it is a very unusual Monogram special ordered with gold pigeons on each lock plate; a 20-bore, serial number 58300, shipped 8/11/23. I didn't record the serial number of the most unusual Monogram Smith I've ever seen; found on a dealer's table at a gun show years ago. It was a 12-bore with 32" tubes on an RE frame. This special ordered gun featured two flying geese on each lock plate; but otherwise had no more engraving than a Grade 2. With the exception of engraving its wood quality, checkering, barrel steel, and factory markings was "Monogram" quality in all respects