I bought a razor with zero information. Its a vintage Tuckmar and Id like to figure out the size. is there a way to measure it? also, whats a half or full hollow? how do I tell which mine is?
I believe it is common in modernity to measure razors from the top of the spine, not factoring spine height variation from razor to razor. I subscribe to the belief that those who produced 'vintage' razors measured from the top of the honing bevel or the beginning of the hollowed portion, thus reconciling the larger-than-advertised phenomenon we frequently observe (e.g., Filarmonica, Palmera, and any other blade marketed at 7/8" but measured at 15/16"). Please note that the former method is marked as "new" and the latter as "old":
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In other words, the following razor was advertised as a 7/8" blade. The reality is that, when measured from top of the spine to the edge of the blade, it is approximately 17/16". However, when measured from the top of the honing bevel or hollowed portion, it's spot on the manufacturer-listed 7/8".
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Of course, production variances and consistency potentially introduce additional consideration. Nonetheless, the above explanation seems the most logical. I hope this offers some rebuttal fodder, or in the very least, a point of reference for further discussion.
Edit: Here's a reference for grinds. Opinions tend to vary once the razor gets between half to full hollow.
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