The Model 87 was introduced in 1969 and is a dated version of the Model 84 that was introduced in 1965. Both are similiar to the Model 40 but with the contacts now replaced with a transistor... this is a Moving Coil, Transistor Controlled movement.

It is interesting to note that the quality of this movement seems significantly better than the earlier, mass-produced Model 40: this 87 has 6 jewels and an incablock-type shock system on the balance end stone.