Seams on my Platinum #3776 tortoiseshell celluloid pen

The patterns around the cap or body on a Platinum #3776 Celluloid pen is unlikely to be seamlessly continuous because, as Platinum Pen explained:

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Before celluloid became used not only in pens but in a variety of industrial products, it had been widely used in several products for its beautiful color reproduction until plastic was invented. A pressed board of layered celluloid is sliced and rolled into a pipe shape mold one by one, and finally they all form a shape of a pen. Due to the nature of celluloid material, a drying process is applied at every manufacturing stage, which in total takes half year to finish the production.

Generally, in the case of a celluloid pen, a 2cm2 block is cut out with a lathe, however, we use the rolling method as mentioned above. Due to the standard lathe process, a seam is visible on the body (seam roll), which at the same time is a sign of our unique production method. Unlike the lathe manufacturing process, we can make a seamless beautiful surface by applying our method when choosing a pattern like a gold fish.。

In addition, we applied a bending process to the crown and the corner of the barrel, so that the whole body is wrapped with celluloid. 

Source: https://www.platinum-pen.co.jp/e_spec_explanation.html#celluloid