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Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils. Stencil image courtesy of Smith Drafting stencil also available form same source.

Now it probably takes a few hours to make this font. And if you want exact same look and feel you may not have much coice on the matter. If you can find a font that closely mathces that is open source then just edit that font to fix the few things that bother you.

* Technical lettering by hand is a pain in the butt.

Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils. Stencil image courtesy of Smith Drafting stencil also available form same source.

Now it probably takes a few hours to make this font. And if you want the exact same look and feel you may not have much choice on the matter. If you can find a font that closely matches that is open source then just edit that font to fix the few things that bother you.

* Technical lettering by hand is a pain in the butt.

Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils. Stencil image courtesy of Smith Drafting stencil also available form same source.

Now it probably takes a few hours to make this font.

* Technical lettering by hand is a pain in the butt.

Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils. Stencil image courtesy of Smith Drafting stencil also available form same source.

Now it probably takes a few hours to make this font. And if you want exact same look and feel you may not have much coice on the matter. If you can find a font that closely mathces that is open source then just edit that font to fix the few things that bother you.

* Technical lettering by hand is a pain in the butt.

Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils to this one. Stencil and stencil image from Smith Drafting

* Technical lettering by hand is a pain in the butt.

Because of the time period these are most likely hand drawn. Probably using stencil, to save time*. Using a stencil explains why 0, O, I, 1 and also the foot of R are done this way, simply they are re using the stencil to save space.

Image 1: Period engineering drawings were made with similar stencils. Stencil image courtesy of Smith Drafting stencil also available form same source.

Now it probably takes a few hours to make this font.

* Technical lettering by hand is a pain in the butt.