Experimental POs of 1950s and 1960s

This post will not be the comprehensive study of the experimental POs during the period of 1950 to 1960 but it will gave some example of postmark and their usage records.  The experimental post offices from early 1950s to late 1960s have the postmark like the example below with different post office number.  The following postmark example shows type 2 of PO 281 dated 22 Sep 1961.  Type has been seen used since 1940s.

Type 2 (left) and Type 1 (right)

The following are the records of some examples with date of postmark and sender's address.

Type 1

PO R-63
xx Jul 1951, Thonze

PO R-81

30 Jan 1951, Myingyan

PO R-89
29 Aug 1957, 27th Road, Between 80 & 81 Street

Type 2

PO 22
22 Dec 1953, Mandalay 26th B Road, Between 81 & 82 Road
22 Aug 1955, Mandalay University College
30 Jan 1956, Mandalay University College

PO 28
17 Jun 1960, Rangoon, Cantoment PO, Fraser Road

PO 46
26 Jul 1953, Moulmein, LM Road
14 Oct 1953, Moulmein, LM Road
1 Jan 1955, Moulmein, LM Road
18 Nov 1955, Moulmein, LM Road

PO 201
23 Jul 1956, Rangoon, 31st Street
25 Apr 1957, Rangoon, Mogul Road (Shwe Bontha Road)
19 Aug 1957, Rangoon, Godwin Road (Lanmadaw Road)
28 Aug 1957, Rangoon

PO 203
23 Jul 1957, Rangoon, Bazaar Street, Kemmendine

PO 271
9 Mar 1961, Rangoon, York Road (Yawmingyi Road)
29 Aug 1961, Rangoon, Mogul Road (Shwe Bontha Road))
16 Jan 1962, Rangoon, Shwedagon Pagoda Road
29 Mar 1962, Rangoon, Mogul Road (Shwe Bontha Road)

PO 281
22 Sep 1961, Rangoon, Thaton Hall, Rangoon University

PO 282
30 May 1961, Rangoon, Mogul Road (Shwe Bontha Road)
11 Jan 1963, Rangoon, Kemmendine, Shwehlaing Road

PO 355
1 Aug 1963, Rangoon, Mogul Road (Shwe Bontha Road)

PO 680
25 Feb 1970, Pakokku, People's Hospital

The list will be extended whenever I found new example to be recorded.