Lovely Set of 3 Antique Drafting Triangles novelty bottle but have not seen another

but have not seen another melted glass bottle with a surface quite like this one

which it most of the time is

5 3/8” t x 2 1/16” d (base) and in great condition

signed on the underside of the lid "M

Lovely Set of 3 Antique Drafting Triangles novelty bottle but have not seen anotherI can't resist these when I come across them; they just make me want to sit down and make geometric drawings. I found these three together and have to think they have been together for a long time, together making an excellent set. The dark one was once marked as a ruler on the hypotenuse; now mostly faded, but a few inches remain visible. The scalene triangle is marked with a Sphynx logo, which I have not been able to place. I'd guess all three date