Some more Bristol related items, starting with a cover from Avonmouth (under Bristol) to the USA in 1930. The envelope is one for the US Hydrographic Office, which would have been free in the USA but not in the UK.
This next registered envelope is from Bridport to Cornwall, going via Bristol and receiving a "BRISTOL / 134 / 15" three bar vertical oval duplex cancel with "15" in the basal bars when it was sent in June 1899.
The cover below is another that went through Bristol in transit, this time from the Cayman Islands to Coventry, receiving a single ring "BRISTOL / 2" handstamp on the reverse in February 1910.
The envelope below is a First Day Cover for the King George V Silver Jubilee issue on 7th May 1935 and received a "Found at Bristol / Without contents" cachet - as an FDC it was unlikely to have had any contents.
Both envelopes below received an undated triangular "134" machine cancel, probably because they were printed matter - the top one also received a dated cancel in February 1937, perhaps because it was going abroad to British Columbia.
The unfranked envelope below was charged 22p postage due in 1983. The postage rate was 12½p for up to 60g but the Postage Due charges had changed to a fixed charge of 10p plus the deficiency rounded down.