I generally won’t advise for or against buying something online - the risks are yours to weigh. I will help you identify what you’ve posted.
Based on the data and pictures it is most likely classes (as @Alexey said) as a min’yo shamisen.
Min’yo shamisens are a subset of chuuzao instruments meaning their neck ranges between 2.6 and 2.8cm wide. The body, the true indicator of the subtype, is termed a “go-rin-dai” body. Meaning it is slightly larger than a nagauta. They’re typically skinned with cat, dog, or artificial leather.
If you look at the doukake, there are some markings on it that (although not perfectly clear) seem to be 五厘大. The presence of this, the sawari used, and the structure of the neck all point to its min’yo status.
This particular example has a sawari and most of the relevant accessories aside from a koma. A fujaku (position marker) has been applied. I see no structural damage to be concerned about - but that doesn’t mean there isn’t any. Should you buy it, be particularly attentive to the sawari mechanism and how tight the itomaki are.
There are some cosmetic chips to the tenjin. The bachi appears to be plastic. It is not kinhoso, although it is a (simplistic) mitsuorisao.
It is probably made from karin, or red oak, so the sound will be very warm and lively.