This article appeared in the Transit Postmark Collector
July - August 1993 on Page 105
 

Milwaukie Avenue CH-6-b
A Closer Look

Stanley Bednarczyk
5303 N High Street
Columbus, OH 43214

     For some time, many specialists in Chicago street car markings have noticed certain inadequacies in the monograph published on Chicago by the MPOS in 1983.  One of these is the lack of information regarding different dies of a particular postmark type.  It is my desire to try to alleviate this situation with an in-depth study of the postmarks of the Chicago street car system.
     For this article, I have chosen CH-6-b of the Milwaukie Avenue line.  Robert Stendal wrote an article for the November 1989 "Illinios Postal Historian" in which he described three different dies of this type.  Further research, based upon seeing 341 examples many of which are from the Virgil Brand find, has disclosed that there are actually six different handstamps of the type 6-b.  While the easiest way to distinguish the different dies is by the use of quality transparencies, they can be sorted with a high degree of accuracy, using a combination of measurement, date of use, and trip number.  These six markings may be distinguished as follows:
 

I

Dial 29mm. 
Distance between lower tip of I in CHI and tip of lower left leg of M 8 1/2 mm.
Between stops after O and E 6 1/4 mm.
Between stop after O and apex of V 12 1/2 mm.
Killer with large RPO 10 1/2 mm wide and no stops.
Usage - 27 Feb 04  -  3 Jan 06
Trip Numbers - 4, 8, 12, 16, 20, 26, 28
31 Examples

II

Dial 29 mm.
Distance between I and M 8 mm.
Between O. and E. 6 1/2 mm.
Between O and V 12 1/4 mm.
Compare shape of letters R and P with above.
Stendal Die I.
Usage - 22 Mar 04  -  19 Dec 05
Trip Numbers - 2, 6, 10, 14, 18, 22, 5
49 Examples

III

Dial 29 1/2 mm.
Distance between I and M 7 1/2 mm.
Between O. and E. 7 1/4 mm.
Between O and V 13 mm.
Killer is approximately parallel with cut out for slugs in dial.
Usage -  9 Jan 06  -  10 Jan 06
Trip Numbers - 6, 18
3 Examples