Figuring out what Montremo (the company in the above photo) does isn't too difficult as those are watch dials on the sign. Checking out their website I learn they are an independent enterprise.
I visited Corum watches back in 2003 and received a nice reception. They're located directly next door to Montremo. In 2013 Corum was bought by a Chinese company. The surrounding area is primarily residential.
Beauregard Manufacture SA occupies a two-story building on the main drag through La Chaux-de-Fonds. It's an independent enterprise making parts for watch bracelets--more specifically pins, screws and laser welding bracelets.
This two-story intriguing-looking building stands in an industrial area in downtown La Chaux-de-Fonds. There's no name or plaque on the building--not even a mailbox. You can't see a thing when peeking in the front door windows as it's blocked off and looks like it's no longer used as an entry door. From past experiences, I'm 100% sure the place has something to do with watches due to its large windows (watchmakers need lots of light) and secure look (watch companies use precious metals and gems). After circling around the building several times I was just about to give up when a guy walks out a side door. I told him I'm from California and was cycling around town looking for watch companies. He says, "you'll find a lot of them around here". I ask him what goes on in the building and he replies, "it's a goldsmith". Bingo!
Back in 2004 I visited head offices of The British Master SA located several blocks from this photo. They own several watch brands; Graham and, Arnold & Son. Both watch brands have offices in this building which houses other tenants.
This is Sellita's new building addition--which isn't quite finished.