@rod222

Rod, I hope you did not follow the write-up of that page because it contains incomplete and false information.

First,
3/B-16/2 is the code of Basavana Bagevadi (16.5681°N 75.9754°E) in Vijayapura district of Karnataka,
not Kaladagi.
B-16 is Kaladagi (16.205°N 75.5015°E), now in Bagalakote district of Karnataka.
3/B-16 is Vijayapura (13.2956°N 77.8008°E) in Vijayapura district of Karnataka.
As earlier explained,
B is the Circle code i.e. Mumbai.
16 is code allotted to the Head Post Office under Mumbai Circle i.e. Kaladagi.
3 is the code allotted to the Sub Post Office under the Head Post Office Kaladagi i.e. Vijayapura.
2 is the code allotted to the Branch Post Office under the Sub Post Office Vijayapura i.e. Basavana Bagevadi.
If it were the killer of Kaladagi, the code would have been
B-16.
1/B-20/2 is Mundra (22.8395°N 69.7213°E), now located in Kachchh district of Gujarat.
B-20 is Bhuj (23.242001°N 69.666931°E) in Kachchh district of Gujarat.
1/B-20 is Mandvi (22.8395°N 69.7213°E) in Kachchh district of Gujarat.
3/B-20 is Morvi (22.81199°N 70.82362°E) in Morvi district of Gujarat.
Br. Indian Morvi SPO was established in 1876 inside the territory of the feudatory state of Morvi which maintained a separate state postal service from April 1,1931 to April 15,1948.
3/B-23 is Mahad (18.078999°N 73.411037°E) in Raygad district of Maharashtra.
B-23 is Alibag (18.6554°N 72.8671°E) in Raygad district of Maharashtra,
not B-33.
3/B-9/1 is Umbraj (17.404005°N 74.102311°E) in Satara district of Maharashtra.
3/B-9 is Karad (17.2865°N 74.1814°E) in Satara district of Maharashtra.
B-9 is Satara (17.6805°N 74.0183°E) in Satara district of Maharashtra.
2/B-5/6 is Akluj (17.8824°N 75.0205°E) in Solapur district of Maharashtra.
B-5 is Solapur (17.6599°N 75.9064°E) in Solapur district of Maharashtra.
2/B-5 is Kurduvadi (18.0963°N 75.4221°E) in Solapur district of Maharashtra.
6/B-7 is Pachora (20.66551°N 75.34799°E) in Jalgão district of Maharashtra.
B-7 is Dhule (20.9042°N 74.7749°E) in Dhule district of Maharashtra.
5/B-10/1 is Supa (15.2765°N 74.5278°E) in Uttara Kannada district of Karnataka.
B-10 is Karwar (14.8185°N 74.1416°E) in Uttara Kannada district of Karnataka.
5/B-10 is Haliyal (15.3306°N 74.7659°E) in Uttara Kannada district of Karnataka.
Finally,
B-6 is Nashik (19.9975°N 73.7898°E) in Nashik district of Maharashtra, not Solapur.
Reference:
The Bombay Postal Circle Its Organisation and Numbered Obliterators 1875-77.
George Eibl-Kaye.
India Study Circle for Philately, Eastleigh, England 1998
Chapter III: The 1877 Organisation; pp.18, 22, 26, 28, 40, 46-7, 50
It is the primary reference for Cooper types 32&32a-c/Renouf and Martin types 17&17a-d used in Mumbai Circle but the list of post offices with specific codes is quite incomplete.