There are two digit codes for Boston’s that describe only two things – filling system and size nib/pen 2-6, generally. The hump filler is almost completely the only exception with an added “s” sometimes. This “s” bit is advanced stuff as you’d never guess it means, essentially, a stepped down nib or nib/feed and applies almost exclusively to hump fillers. It leads me to believe there was a flow problem for this type of filler for its size therefore, a 53s is a 5-humpfiller 3-sized nib/pen with a 2 sized nib. So that was what was being sold a BCHR 53s.
Boston BCHR 53s
So this pen should have brought $250 clean but, this pen wasn’t clean – it had the wrong section and nib. OK, given that, $175 would seem a top price. Well, it has a different kind of add-a-clip though, I don’t know anyone that collects those. The nib is a - Standard 14K 2 – which to anyone remotely familiar is not a –Boston Safety Pen 2 - . So I was wrong! This brought a stupendous $565!!! I shake my head as a proper section would be practically impossible to find - still, brought three times what I would have estimated. I own five hump fillers including the earlier side slide model so I do have a good grasp on these - I thought...
Boston RMHR 53s with roller clip - from my collection
Closeup of the filling system - the slider slides up and the bar depends on the sac to push it back in place after the sac fills.
Here is the auction link - My link
Roger W.
