These engines, after much deliberation, have been confirmed as Schoenner 112/21 and 112/22, circa 1900. Thanks to Oliv, Maxwell and others.
I had some time to work on the boiler of the /21 today. One of my slipshod solder jobs on the SV bung had failed, so for good measure I re-soldered each of them while I had the cap off. Shortly the boiler was ready for the bath:
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After 25 minutes, the color was looking appropriate:
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So I carried on with reassembly.
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