Current RETAIL value is somewhere between 80 and 100 dollars. If you sell it to a coin dealer you'll get maybe half of that amount. You could probably get a little more from a collector but finding someone looking for that coin might not be too easy. Good luck either way.
Using the PCGS coin grading App, your 1919 SLQ appears to be at least an XF-40 to XF-45 grade, though I wish the photos were in a bit better focus. Switching to the PCGS Price Guide App, the current retail for that coin in XF-40 condition is $100. I’m sure that will be for a coin in non-dug condition. PCGS (and other grading services I presume) note on their slabbed coins that were “dug”, that there is Environmental Damage, which would lower its collector value.
Was yours dug from the ground?
In any case, it’s a beautiful specimen.
Jim