In my opinion the 4th Bn badge which is lugged is the 1908 TF bought badge.
In 1915 when the ACD took over production of the badge they changed it to blank scrolls. It was briefly made in all brass in 1916 before the TF Bn adopted the regular pattern badge.
I assume that although there was no other TF Bn the Army wanted to have a single generic blank scroll badge (as they did for the Essex) so it was usable by other Bn rather than just the 4th.
The 1918 Volunteer Bns were authorised to wear the (former TF) blank scroll badges but many were still wearing VTC or GS cpa badges at the end of the war.
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