Scavanged Motors

These two motors and gearhead assemblies came out of a Universal Stereoplotter from my school. They are swiss made Portescap motors labeled as ESCAP 26L28 213 4 with Portescap gearheads labeled as ESCAP 26.1 156:1.

Pictures:

(One complete assembly with the other broken apart)

(That's the motor on the left and the gearhead on the right.)

(Motor on the right again and the gearhead on the left. Both from the other ends.)

I did some searching online for these motors/gearheads and came up with the following links:

26 Series Motors

K Series Gearheads
(Most of the way down the page and listed as 26.0 instead of 26.1. Don't know what the distinction means.)

My question is: How much are these worth. Neither listing is exactly what I have because they are fairly old though lightly used.