Posted By:
scott brockelmanThe middle is a 150 the outside pair 350's, the 150 series is always a very nice bold blue with great registration, the 350's will always have the washed out appearance due to lighter inking of the presses and a bit of registration problem.
Go though your old auction catalogues and you should be able to tell the difference, however it can be deceiving as many 350's look great by themselves until placed beside a 150.
Scott