Sauer 143655 probably experienced final proof between 1910 & 1912. From memory, D.R.G.M. 157556 was from January 1901, so D.R.G.M. 130243 would have been circa 1898. It was for the blade type cocking indicators and I think were activated by the hammers. The safety is a Greener(Birmingham, England) type safety. Neat straight grip stock with swivels. 27" tubes is an interesting length.

Kind Regards,

Raimey
rse