Batum

1919 Scott 6 5r brown "Aloe tree"
Quick History
Batum is a port on the Black Sea, and is the Capital of the territory of Adzhar. In1921, It became an autonomous republic of the Georgian SSR.
After the Treaty of Versailles,  stamps of Batum were issued between 1918-20  under the occupation of the British.

Stamps of Batum in Big Blue
Big Blue Picture
On two lines of one page, Big Blue (1997) has 12 stamps spaces for 1919 and 1920.
The 2011 Scott Classic Specialized catalogue has 65 major stamp descriptions.
Coverage  by Big Blue is 18%.

Big Blue's coverage is reasonable for these fairly expensive stamps, but there are six  inexpensive stamps that could be included.
1919
17,18,18 ($1+)
1920
63,64,65 ($2+)

1920 Scott 65 50r dark blue  "Aloe tree"
Overprinted "British Occupation"
Big Blue Checklist
1919
1,2,($5+)
3,4,($2+-$5+)
5,6,($10+)

1920  (1919 issue overprinted "British Occupation")
57,58,59,60,61,62, ($2+)

Batum, or Batumi, is located in present day Georgia on the coast of the Black Sea
Kinds of Blue
The 1997,1969,1947 and 1941 editions are identical for content.

1919 Scott 5 3r violet "Aloe tree"
Part of the first issue
Big Blue Bottom Line
Stamps included by Big Blue are a bit costly ($2+-$10+), but reasonable. Left out were some inexpensive varieties ($1+-$2+).

Note: Unfortunately, some of these Batum stamps may be forgeries.
(Further Note: 7-30-2012: Actually, by sheer luck, considering the abundant forgeries, the images on this site all show genuine stamps.)

If one counts 7 dots-rather than 6- along the top of the right lower denomination box, probably a forgery. (Further Note 7-30-2012: Actually, if one counts 7 dots for the Kopeck values, then certainly a forgery.)

(Further Note 7-30-2012 : I am preparing a MAJOR blog on the "Aloe Tree" forgeries, which should help to clear the confusion. This should appear around November, 2012.)

(Final Note! ;-) - The "Aloe Tree" forgeries post is published! )
http://bigblue1840-1940.blogspot.com/2012/11/batum-and-aloe-tree-forgeries.html

Note, Map  appears to be in the public domain.

Note: You will need to consult a Scott catalogue for specific pricing. I only give a very "ball park" price, and never the actual catalogue value.
<$1= less than a Dollar
$1+= more than a Dollar
$2+= more than two Dollars
$5+= more than five Dollars
$10+= more than ten Dollars
$20+..and so on.