I have a very small (4-3/4" x 1-1/2") smoothing plane similar to that shown in fig. 538, item c (top right) on page 361 of Salaman's Dictionary of Tools, 1975.
Rear infill and wedge are rosewood, front infill looks mahogany. Bridge is brass or gunmetal and is stamped with the Holtzapffel mark. Body is steel, and the tapered iron is not marked and is not laminated.
What can you tell me about Holtzapffel & Co as a planemaker, and who might venture an opinion regarding a range of values in today's market?