If you look at the first pic of the buttstock, there is no thimble (the bolt takedown). It looks like there was never a thimble, it would be to the rear of the sling cutout.
The first pic shows the buttplate, and the top looks more angled than the K98k angle, it looks very rounded to me, more like a Belgian short rifle (like the model 24 or 33). Could just be the picture.
The 2750 under the bolt handle is the serial number from the original rifle the bolt was matched to. The bolt is mismatched, not a big deal and fairly common.