Thanks for the report, very helpful as 1926's were a short run and not common...
WaA14 is seen early, I do not have trends handy, but it didn't last all that long - e/6 lasted pretty much throughout, but others replaced e/14, probably so he could move to Berlin and Rheinmetall-Borsig, also sometimes DWM, but like with Simson and Solingen inspectors seemed to have a senior member and lessors moved around regularly, - e/6 was stable for Suhl, e/14 became stable for Berlin area work, but about a dozen moved around and worked the three main small arms related sites. Simson would see quite a few pass through in periods, e/33, e/46, e/76 & e/81 especially but others I am forgetting away from trends. (many would seemingly become lead inspectors in the NS era, especially e/46 and e/81)
The "&" and numbers between the waffenamts are what we (I) call qualifiers, that is what Joe Steen called them anyway... while we do not know what they mean specifically, by association they "suggest" re-inspection of the installation and "mating" of a new barrel (recounting or reconducting the original steps and acceptance). This "seems" to be a practice only used by HZa Spandau as all examples that can be associated to a HZa are believed to be HZa Spandau worked up.
** there are only 3 known (to me) Simson/26's, none especially original, one is Bob Jensen's example, the other I forget (*Frank), but a re-barrel. This RR pattern (E/6 E/14 E/14) is general from the beginning of 1925 production(2500 range) through the late a-block which passes the 1926 variation and throughout type I (S top receiver) & most of II (S RR & adoption of the Kar.98b SR - Mike has his own pattern-formula)
*** I should mention CB (Craig Brown) once said that he felt the Type one's (S top of receiver) were rare in his view and he took a stretch to get his, which was very nice. The seller was something of a jerk and I let it go early but CB went the full stretch and picked it up. I think he did a datasheet for it but as he had no camera I only have the few auction pictures.
Nor I, though I have seen odd characters before, - regardless i do not trend the variation patterns of qualifiers, they are to diverse a mix and would be quite a task to trend even if there was a consistency to the possibilities.
That is a type I, the first variation after the dated.... very elusive though they "seem" to range about 3000 in numbers estimated... 1926 only run about 2000, but these are rough guesses based upon a rather small number of observations.
If anywhere near original that 3361/a is a valuable rifle!