Dear English John,
I don´t believe the pens are different. I once had a PROFIL series pen, and from the outside it looked fine. When I took it apart, and took the feed out, the section was broken into two pieces. This you can´t see until you take the feed out, because the feed with the “hook” on the top which fits in the tiny hole keeps it together.
I will try to send you a picture of what I have in mind. There also might be something lost in my translation, sorry for that.
Your pen looks to be in an excellent condition, there might also just be a missing seal, or something not very difficult to replace. I will check for the spare parts, but you should take it apart anyway. I am not sure about the sealant ... J
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Please see my collection here:
LAMY_17_special; LAMY_42_Lady_-_set; LAMY_67P; LAMY_74_dialog3; LAMY_80_special; LAMY_81;_281_profil_-_set;