It doesn't look like a Plus to me, at least not originally. It looks like one of the upgraded models that started life as a 128K or 512K. Check the serial number under the machine. If it ends in P, it was a 128K, WP means it was a 512K, and A means I looked at the low light pictures and saw it incorrectly. But my money is on the upgrade.
To go one step further, you can see if it was an original Mac, or a 128K if it ends in P based on the month. F stands for Fremont, the next number is the year made in the 80s, then the next two numbers tell you which month it was made. So if it says F425...... you know it's an original mac. If its F451...... it's a 128K. I think the swap over was September 1984.
To go one step further, you can see if it was an original Mac, or a 128K if it ends in P based on the month. F stands for Fremont, the next number is the year made in the 80s, then the next two numbers tell you which month it was made. So if it says F425...... you know it's an original mac. If its F451...... it's a 128K. I think the swap over was September 1984.