As Raimey mentions, E.C. Schmidt was a long time employee of William Schaefer in Boston before striking out on his own following the demise of the Schaefer concern in the mid-1890s.

The presences of (real) side clips on this gun is a significant clue. Sideclips on Prussian Dalys are first seen circa 1901/2. Sideclips are mentioned for the first time in the 1902 SD&G catalog, but the picture accompanying the write-up show a gun without sideclips. The 1903 SD&G catalog has the sideclips in the description and in the photo.

It is an odd configuration for a 10 gauge. Though that said, a couple of months ago I was admiring a neat under-lever Prussian Daly hammer gun made after 1900. The customer was king apparently, even if they wanted to order something weird.

Ken