Mr. Hallquist:
If those tubes in question are post 1897, I wonder if Armstrong was sourced for the Whitworth steel. Any idea of the importer on the American variants? True in 1897 the engineering firms of Armstrong & Whitworth merged but there looks to have been a merger of the Armstrong & Whitworth steel concerns in 1882(or was it Armstrong-Mitchell)???? I may have to eat some crow, which is fine, on Purdey getting tubes from Whitworth, but I still hold that they sourced from an actual tube maker. I've seen copies of a sales book page for a 1927 Purdey that was fitted with Whitworth tubes. Was there a Whitworth steel concern, Whitworth engineering or both?

Kind Regards,

Raimey
rse