The yellow stamp has a border design identical to a series listed in Scott's but given no numbers or values. The note says "Nine values commemorating the Guiqui-La Pas railroad were printed in 1915 but never issued. Typographed forgeries exist"
Not sure if that helps. The yellow border is an interesting element.
There was another post here in the last month or two that had another stamp seemingly from that issue. I'll have to do a search.
edit- that was easy to find.http://goscf.com/t/18828&SearchTerms=,bolivia
Not much help I'm afraid.