"18.5" SL2000 MONOFLAP MEDIUM THEO SOMMER GERMAN MADE ENGLISH SADDLE.
I believe this is a Monoflap and the seat measures 18.5" from the center of the Cantle to the nail or button on the side. I measured the craw to the very best of how it should be done. It was produced in Germany by Theo Sommer who is considereded a leading quality dealer in this field. It is hard to see however stamped in the leather on one side "SL2000 Exclusive for Miller's USA".