| Receiver Inset No. 1L
Used in most early bakelite handsets. Fitted with an Earpiece No. 18. |
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| Receiver Inset No. 2P
Used in later bakelite handsets. Fitted with an Earpiece No. 23. |
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| Receiver Inset No. 3T
Used in Headsets and Trimphones. |
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| Receiver Inset No. 4
Used in many 700 type telephones. Later Receiver Insert No. 4's comprised of a No. 3T inserted into a plastic housing which resembled the No.4 - dimension wise. |
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