** I think the part number is HM401, but it doesn't say it on there, so I'm going by what else I saw on ebay **

I have not used this - I bought it used.  It powered up when connected to my camera just fine, and made all the right noises.  So it seems to be in good working condition.  Cosmetically, it shows signs of wear, but just on the outside.  The inside looks great.

No returns, sold as-is.

Keywords: Medium Format Mamiya Hasselblad film digital camera back #2