Did you grab the file for this from somewhere, or make it yourself?
I made it myself in Blender.
I couldn't find much in the way of 15mm interwar stuff available anywhere else, so I decided to see what I could do by way of 3d printing. It's still a bit expensive compared with most metal or resin models, especially in the high-resolution resins, but I assume the price will drop over time — I see, for example, that a desktop 25-micron stereolithography printer can be had now for about the same price as I paid for my first 300dpi black-&-white laser printer, so all I have to do to be able to afford one is live long enough