How to tell rev # and diff a prior version w/ previous version using TortoiseSVN?

Question

Using TortoiseSVN, I checked out a branch (HEAD) and then changed the local copy's revision to an older revision with Update to revision....

For example, say the HEAD is rev.20. I updated to rev.10.

1. How can I tell what is the rev number of the current local copy? When opening the log or the revision graph, I get all the revisions up to the HEAD (1 to 20), w/o an indication for the checked out one (10).

2. Trying to Diff with previous version I get a diff of the local copy of the file (10) w/ the HEAD-1 (19) revision, which is actually a later revision than the local one. How do I diff with the previous-to-local (9) revision file?

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Update 1: It appears that Show log shows the line of the current revision in boldface font, so this indicates what revision is currently updated to the local copy. Similarly, revision graph emphasizes the revision rectangle.

Update 2: I must have done something wrong before posting the question. It looks like now the Diff with previous version works as expected.