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postage

1951, Jan 30 Society of Engineers 60th issue unwmk p. 12.5

-

20c

multi

emblem & map

1951, Oct 20 p. 13x13.5

-

25c

blk

Guillermo Valencia

1951, Dec 11 ovpted wmk. wavy lines & C multiple p. 12

-

2c

red

ovpt, oil wells

airmail

1951, Sep 15 Lansa 1951 issue ovpted (8 stamps)

-	40c	orgyel	on 40c-orgyel-unissued (0)
-	50c		ovpt, Spanish Fortifications Cartagena, w. unwmk, p. 12
-	60c	grayol	ovpt, Street View of Bogotá, w. unwmk, p. 12
-	80c	brn	ovpt, Pre-Columbian Monument, w. unwmk, p. 12
-	1p	olgrn & viobrn	ovpt, Proclamation of Independence, w. unwmk, p. 12
-	2p	grn & bl	ovpt, w. unwmk, p. 12
-	3p	pnk & blk	ovpt, w. unwmk, p. 12
-	5p	brn & blgrn	ovpt, National Library of Colombia, w. unwmk, p. 12

1951, Oct 1 Avianca 1951 issue (8 stamps)

-	40c	yelorg
-	50c	ultra
-	60c	gray
-	80c
-	1p	redorg & redbrn
-	2p
-	3p	chocbrn & grn
-	5p	org & gray

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