@No1philatelist
Quote:
Joy, I have to ask since I have not seen them before. You state that one half is still on the other part. Were they cut or rouleted? And is the other side as large as what is shown?
Here are the some of the respective complete Br. India telegraph stamps without any perforation or roulette.
Br. India 1890 1A SG T42
Br. India 1890 4A SG T44
Br. India 1890 8A SG T45
These telegraph stamps were afflixed on telegraph form in designated place so that the upper halves remained on the sender's receipt form parts and the lower in the message forms which were retained by the telegraph offices and subsequently destroyed (hence is the scarcity of the lower halves) vide Para. 6 of the Telegraph Department Notification dt. December 22,1868 issued by Daniel George Robinson, Director-General of Telegraphs in India (1865-77) in Kolkata.

The receipt and message form parts with telegraph stamps were cut with scissors, thus cutting the stamps in more or less transversely along the center.
Here is an example of upper halves of telegraph stamps on sender's receipt used at Karachi Central Telegraph Office.
Sender's Receipt Form No. FA, introduced in December 1,1883
References:
1. The Postage and Telegraph Stamps of British India.
Leslie Leopold Rudolph Hausburg, Charles Stewart-Wilson and Charles Stanhope Foster Crofton.
The Philatelic Society of India, Kolkata and Stanley Gibbons Limited, London, England 1907
Part II: Telegraph Stamps
Section V: The Single-Headed Issue and Two Rupees Provisionals; pp.179-82
Section VI: The Edwardian Issue and the Provisionals of 1904; pp.183-5
Reference List; pp.187-8
Appendix B: Tables of de la Rue Plates
B: Second Series of Plates, for Indian Stamps Only; p.214
C: Third (King's Head) Series; p.215
2. Stamps of India.
Jal Manekji Cooper.
private, Mumbai 1951 2nd Ed.
Chapter XVI: Telegraph and Revenue Stamps; pp.181-2
3. The Encyclopedia of British Empire Postage Stamps 1775-1950 (Vol.III: The Empire in Asia).
Ed. John Harry Robson Lowe.
Robson Lowe Limited, London, England 1951
Part II: South Central Asia
Chapter III: India
(l) Telegraph Stamps; pp.197-8
4. Billig's Philatelic Handbook (Vol.XXXIX).
HJMR and Company, Hollywood, USA n.d.
Part II: South Central Asia
Chapter III: India
(l) Telegraph Stamps; pp.197-8
5. Stamps of India.
Jal Manekji Cooper.
private, Mumbai 1968 3rd Ed.
Chapter XVI: Telegraph and Revenue Stamps; pp.137, 139
6. A Specialized Priced Catalog of Indian Stamps (1852-1970).
Ed. Jal Manekji Cooper.
private, Mumbai 1971
Telegraph Stamps; pp.106-7
7. India Punches, Dies and Plates.
Ed. Derek Lang.
India Study Circle for Philately, Eastleigh, England 1984
Part 1: The Punch and Registration Books etc.
Section 4: Telegraph Stamps
Extracts from the Registration Book for India Telegraph Stamps; pp.55-6
8. The Silver Key to the Golden Treasure of Indian Philately.
Manik Jain and Shriballabh Kothari.
Philatelia, Kolkata 1986
Chapter XXI: Telegraph Stamps of India; p.160
9. Indian Telegraphs (1851-1914) Philatelic and Operational History of Indian Telegraphs.
Ilyas Ahmad Patel and Dhanañjay Shantilal Desai.
Desai and Company, Ahmadabad 1995
Chapter V: Telegraph Stamps
Third Series 1890 (Single Headed Series); pp.140-1
Fourth Series 1904 (Edward VII Series); p.142
Annexure 5.2: Tables of de la Rue Plates; pp.159-60
10. The Imperial Post Offices of British India (1774-1914) (Vol.II).
Mohinilal Majumdar.
Philatelia, Kolkata 1999
Part VI: The Philately: Postage Stamps and Stationery
Chapter XXV: The Telegraph Stamps Issue; pp.452-4
11. Telegraph Stamps of the World.
Ed. John Barefoot.
John Barefoot Limited, York, England 2013
India; pp.71-2
12. Phila India 2015-16 Stamp Guidebook (1800-2015).
Ed. Manik Jain.
Philatelia, Kolkata 2015
Telegraph Stamps; p.43
13. Philcent India 2016-17.
Ed. Premchand Jayaswal.
Philcent Publications, Kolkata 2016
Telegraph Stamps, Covers and Forms; p.21
14. Stanley Gibbons Stamp Catalogue India 2018.
Ed. Hugh Jefferies.
Stanley Gibbons Limited, Ringwood, England 2018 5th Ed.
Telegraph Stamps; pp.166-7