Here is an unnumbered example of the Medal "For Labour Valour" awarded to Nikifor Petrovich Gajsenok on 26th June 1951 for his long service to Chisinev Railway, Moldovan SSR. Unfortunately it does not state the length of service. It will be either 5 or 10 years.
With the addition of this 3rd January 1935 Document it would mean the long service will have been 15 or 20 years as Gajsenok was an Instructor of the Political Section of Moscow-Donbass Railway Construction.
On 29th April 1945 his position was Head Accountant when he was awarded the Chest Badge "Excellent Administrative Worker". "For good figures for the May Socialist Competition".