I have just obtained an early MK1 type Bren mag tin without the horse hair seal around the edges. I notice that although the lid has a raised rib to stop the mags rattling about inside there is also no horse hair felt attached to this rib and it doesn't look like there ever has been. Did any of these early MK1 tins have felt attached to the centre rib or was it only the later examples with the seals around the edges, please?