Enders Special Service & Enders Royal Service along with Enders Oakleaf were made by Crescent Fire Arms Co. for Shapleigh Hardware Co. of St Louis, MO in the early 1900's. It is not a rare gun nor expensive. Perhaps $200 if in good condition.
probably but to be safe have it checked out by a gunsmith..............
Lender's royal service # 117709
Trade name. Made by Crescent. 50-100 USD value.
Have it examined by a competent gunsmith
Being a .410 helps, the condition hurts. Possibly $200. sales@countrygunsmith.net
No known published sn data
Possibly Enders Royal Service? Blue, Hound, Whistler are a few others
Carl Enders, Suhl Germany. Made high quality double barrel 12 gauge shotguns from 1835 to 1890. They had ornate checkering and engraved metal work. Depending on the condition and workmanship the value is between $500-$1150.
I found a set for my Enders Special Service a.k.a. crescent on eBay of all places. It took some time and alot of questions, pictures and measurements but was worth the wait. There are many barrel sets that will fit with a little tinkering.
Some Enders Royal Service shotguns are Crescent Model 60's marked with Shapleigh Hardware's trade name, but some were made by other manufacturers.
Enders Royal Service shotguns were distributed by HD Folsom to the hardware trade from c.1890-1920. They were imported from Belgium (will have proofmarks) and made domestically by at least two different manufacturers.