Gruen Materal Catalog 448
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The famous Gruen 448 material catalog. This is the 1948 version of the material catalog and has a slightly different format than other versions. For example, you get a picture of each movement in this edition. Get the same colorful cover and an interior consisting of clean, white, more durable paper than the originals. A great edition to your horological library and a must-have for any Gruen restorer or tinkerer.