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A thin oil gives (arguably) the finest finish, but water with a little dish-soap in it is a good alternative.

Regards,
Neil

Yes - definitely a tam and a nice one, too! The square section is often a giveaway, like this one from the old Carron Ironworks in Stirlingshire:
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"C & C" and "Go-Ahead" were trademarks of Colquhoun & Cadman, based at the Douglas Works in Arundel Street, Sheffield, as listed in a 1901 Trades Directory. The firm dates back to 1892. The two...