Hi jerrybyers,
As mentioned before, your SR was made by Alexander Coppel, Alexanderwerk 1821-1980, Solingen, the trademark spells ALCOSO .
Those SR may be underrated overseas, but here in Germany they are rare valuable collector items, especially in that excellent condition yours is.
Over the years I only found one more nice ALCOSO #110 on britva.ru
Attachment 79842
and one more ALCOSO MASTER on ebay de
Attachment 79843
Greetings from Razortown
Rainer