I used the typical circuit for astable mode as shown here. However, please note that in my circuit, C1 is 10uF, C2 is 10nF, R1 is 1k, R2 is 39K, R3 not shown would be LED limiting resistor connected to pin 3, and there was D1, the LED also not shown. As I say, the circuit did not work with a tantalum bead capacitor for C1. And C1 was connected correctly, the positive lead is clearly marked with a + sign. When I inserted an electrolytic for C1, the circuit worked.
The actual capacitor used is as per the picture: 10uF, 25V, Plus sign near one lead. Where the reflection is, is a circle with what looks to be a 2 or z. I presume this capacitor has too much leakage for the circuit. I replaced with another of same type, LED flashed about 5 times then on continuously.