However there is one pencil that could be the Promate's twin, aside from not having a rubber coated plastic barrel. Instead the Alvin Draft/Matic DM03 has a plastic body. Otherwise they look identical, as shown by the side-by-side presentation in my post, Two Of a Kind. They even share limited interchangeability of parts! If it were not for a few internal differences the 2 pencils could have been produced in the same factory, even on the same machinery. But it's the differences that make the Ohto Promate it's own pencil and not a "clone".
The Ohto Promate id constructed of a plastic barrel covered in rubber, which happens to be black. There is a bright metal nut/spacer in the tube that the knurled chromed metal grip/tip screws to. The inner lead reservoir is a clear plastic and the clutch mechanism is housed in a white translucent plastic. There is a small spring that supplies the return force to the clutch mechanism that fits between the white housing and the nut spacer which has a short tube that fits inside the grip/tip. The lead reservoir does not come free of the pencil because the tube the eraser fits in is metal and fits over the lead reservoir. As the reservoir is pulled out the eraser holder hits the part of the nut/spacer inside the body tube. The push button cap is removed to show the eraser. The eraser is removed so the reservoir can be filled. Beneath the eraser is a clean-out-rod.
The appearance of the Promate is very attractive. Like I wrote above, very classic in design - the contrast of the flat black rubber coated barrel and the silver colored imprinting on the barrel as well as all the chrome plated exterior metal parts reminds me of a Black Tie Social Event, to which the Ohto Promate PM-703 would look right at home.
For those of you who like such details, it only takes 2 "clicks" to get enough lead out to write with. Thereafter a single "click" will advance enough lead as you continue to write or draw. With so little lead exposed there is very little "wobble" of the lead in the lead sleeve so lead breakage is held to a minimum.
The 2 drawbacks I can see with the pencil concerns the LGI at the top of the pencil. In bright light the silver on black letters and numerals are hard to see due to glare. They are better viewed in a shade or low light or indirect light. The chromed LGI housing is extremely loose. Just handling the pencil can cause the LGI to move enough to move off the initial setting. There doesn't seem to be any way of tightening the housing, so it's just something I have to get used to.
Despite the LGI problems, which are really minor, the Ohto Promate PM-703 is a very good example of a classic drafting pencil. However the Ohto Promate is no longer made, so if you want one you will have to do an Internet search to find one.