M1845 & M1849 Naval kammerlader
One of the gems of my collection – a naval kammerlader not converted to cartridge and with the 
original rear sight. They hardly exist at all. – I believe I’ve seen some ten or so with the original rear sight over the last 30 years.
As mentioned, all Navy archives were burnt during WW2 and therefor there is no factual infor- mation in regards to model years, quantities
produced etc. As far as I’ve been told, there were made 100 navy kammerladers in 1845-1848 and then an almost identical serie in 1849-1851, but here the numbers are rather confusing. The highest number I have seen being almost identical to the M1845 is # 99. But I have also seen #136, but that had a similar mechanism to the army’s M1846 with the wider hammer. It seems there were made some “bits & pieces” in the 1850-51.
Both the M1845 % the M1849 are very like the army’s M1842 with the narrow hammer etc. and are more “old-fashioned” than the army’s M1846. The naval kammerladere had about the same length as the later M1859 for the army, 
but the first three models always had three brass bands on their large bore kammerladere.
The difference between a M1845 and M1849 is only supposed to be use of thinner brass for the bands and that all the screws on the M1845 were numbered (I have, however, seen numbered screws on the M1849 as well). You can, of course, also tell the difference by looking at the production year.
An interesting detail is that the locking of the side-lever on the naval kammerladere is a square lump of iron fastened on the locks right side. The army models had three small 10 mm long rods sticking out as locking device – and kept to this. So alike and yet 
these strange little differences.
The M1945 and M1849 in good condition and with the original rear sight are scarce. These first naval kammerladers saw a lot of wear and tear, as did the army’s M1842. Most of them were rebuilt to the Landmark cartridge systems, but my guess is that the ones that had seen the hardest use or had defects were scrapped instead of repaired and that these are the ones we can find today.