For many years, I have been keen to collect all kinds of hard tube oil furnaces produced by MSR in the past 40 years. This article focuses on showing the period from 1973 to 1978. Before the G appeared, white gasoline was used as fuel. Stoves, model 9 and 9A Two models 9 and three 9A are shown here. In order to distinguish them easily, in the following figure, they are represented by 9# 1, 9# 2, 9A 1, 9A 2, 9A 3 from left to right Each stove comes with an aluminum cup, which is used to cover the stove head when stored. The metal fuel pipes of these five furnaces do not have steel wires for cleaning fuel pipes, but early metal rods. Pumps used two materials and two different structures in this era. 9# uses compressed fiberboard as the bottom plate, and 9A is modified to black bakelite. Compressed fiber bottom plate, 4 openings on the side of the aluminum shell of the burner, and wrinkles on the edge of the fire bowl, these are the unique features of 9# 9# uses two different color pumps. White is the original commercial version. Due to material problems, white pumps are prone to cracks. MSR subsequently produced yellow pumps to make up for this defect. In addition, the steel wire pot holder is also different, the horizontal part 9# 2 is lengthened. There are currently three versions of 9A found. From this angle, you can see the different openings on the sides of the aluminum shell. Compared with the previous generation 9#, 9A 1 and 9A 2 have eliminated three openings, and 9A 3 has added one again. It is always difficult at the beginning. MSR has been constantly trying the best solution for this unprecedented new product. 9A 1 uses the previous generation 9# 2 yellow pump, and 9A 2 MSR has made a small change to the yellow pump, mainly due to the difference in pump rod removal method and handle color. There is no big difference between 9A 2 and 9A 3 except for the difference between the holes on the side of the aluminum shell mentioned above. The pump is also the same. The 9A 2 and previous models all use a round reed to fix the steel wire pot holder and the tubing hook. The 9A 3 uses a C-shaped opening circlip in these parts. The above are some of the differences I found by observing my own collection. It is not a strict identification standard. I welcome friends who like these amazing stoves to participate in the discussion. Model 9 and the commemorative T-shirt released for it later, the chest pattern is re-engraved with the patent application pattern of the year. The magic stove ~ When I brought it home in 2018, it was already a 46-year-old "old" guy. Physical examination found that it can ignite normally without replacing any vulnerable parts. The white pump of Model 9 is difficult to preserve completely due to material problems. It is considered a survivor.