A recent post on the Ricoh Facebook page sheds light on this. There is a former employee who has a large portion of the collection, and maintains his own "Camera Museum" in Ibaraki Prefecture.
There were recent Pentax Fan Day events at the Ricoh Imaging Squares in Tokyo and Osaka, and some rare items were borrowed from this museum. I think that's why they are in contact and featuring the museum at this time. The report also makes mention of the company's own collection, so some of the museum's exhibits may still be with the company.
It's possible to visit the museum free of charge, but you have to call in advance to make sure that it is convenient for the owner. Also, I have no idea if he is an English speaker or not. Contact information:
「カメラ博物館」「写真はうす」
住所:〒321-3707 栃木県芳賀郡茂木町小深101-2
電話番号:0285-61-1650(来館前には必ず電話で確認を)
開館時間:10時~17時
入館料:無料
休館日:特に設けていないものの、不在のこともあるので、来館の際は事前に電話で確認をとのこと。
There's a report in Japanese and several photos on the Ricoh Imaging FB page, posted on April 28, 2019.
?????? (PENTAX by RICOH IMAGING) - Home | Facebook
Last edited by JPT; 04-30-2019 at 07:37 PM.